First, the researchers had personal cultural bias which led them to the completely wrong assumption about people's behaviors in different cultures and traditions: 」The researchers assumed that putting money in the wallet would make people less likely to return it, because the payoff would be bigger.「
Secondly, the 'researchers' lacks scientific attitude and appropriate methodology. The experiments were designed with logical flaws, and data collected were distorted and improperly analysed. The authors jumped to a conclusion from very limited data which could have many explanations.